How do you signal to proceed at a manned Block Station when going against traffic?

To signal to proceed at a manned Block Station when traveling against traffic, the correct method is to use a green flag by day or a green light by night. This signaling practice is essential for maintaining safety and clarity in communication throughout the railway network, especially when a train is operating in the opposite direction of normal traffic flow.

The green flag during daylight serves as a clear visual signal indicating that it is safe to proceed. At nighttime, a green light serves the same purpose, ensuring visibility and understanding in low light conditions. This consistency in signaling is crucial as it allows train crews and personnel at the Block Station to communicate effectively and reduces the risk of confusion or accidents.

Using a red flag would typically indicate a stop or caution, which is contrary to the required action for proceeding. Similarly, waving the arm is not the standardized procedure for signaling in this context. Flashing the headlights, while potentially useful in certain situations, does not replace the formal signaling requirements specified for manned Block Stations when a train is operating against traffic.